Advertising display unit



FIG. 1 is a front perspective view of an advertising display unit, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof.

The broken line disclosure of the indicia in FIGS. 1 and 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an advertising display unit, substantially as shown and described. 